I have to use linksys PAP2 in order to use voip phone.
I have a Zywall USG 20w router, I'm able to call OUT but
nobody can call me IN.
What have I to configure?
I already set UTP ports: 5060-61, 53, 69, 10000, 20000 in order to forward them to my linksys PAP2. But it doesn't work anyway.